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. For each scenario below, use a simple regression model to test the null hypothesis that the slope coefcient is 0 versus the alternative hypothesis of greater than zero (using a = 0.05). Then determine the twosided 95% confidence interval. (a) A random sample of size n = 38 with 31 = 5, 3:31 2 2.1 (b) A random sample of size n = 29 with 31 = 6.7, 3E1 = 1.8

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